EP0688063B1 - Electrical apparatus with clamping screw - Google Patents

Electrical apparatus with clamping screw Download PDF

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Publication number
EP0688063B1
EP0688063B1 EP95401292A EP95401292A EP0688063B1 EP 0688063 B1 EP0688063 B1 EP 0688063B1 EP 95401292 A EP95401292 A EP 95401292A EP 95401292 A EP95401292 A EP 95401292A EP 0688063 B1 EP0688063 B1 EP 0688063B1
Authority
EP
European Patent Office
Prior art keywords
screw
head
fact
thread
cylindrical hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95401292A
Other languages
German (de)
French (fr)
Other versions
EP0688063A1 (en
Inventor
Guy Eschermann
Pierre Merlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication date
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Publication of EP0688063A1 publication Critical patent/EP0688063A1/en
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Publication of EP0688063B1 publication Critical patent/EP0688063B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34—Conductive members located under head of screw
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/002—Measures against loss of bolts, nuts or pins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/302—Clamped connections, spring connections utilising a screw or nut clamping member having means for preventing loosening of screw or nut, e.g. vibration-proof connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/999—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener with retainer, e.g. tether

Definitions

  • the present invention relates to an electrical appliance comprising a plastic cover or cover and provided with at least one connection terminal using a conductor clamping screw whose threaded rod can be screwed into a clamping hole tapped with a fixed connection piece and whose head is itself threaded to ensure, at the end of unscrewing, the maintenance of this head in a hole retaining cylindrical formed in the cover.
  • connection terminals of this type is described in patent FR-2,667,989.
  • the operator working on such a terminal experiences some difficulty in screwing or unscrewing the screw when the threads of the head and corresponding threaded hole in the cover are engaged.
  • the invention aims to overcome this drawback by allowing a electrical device to accept connection of cables or closed lugs to the by means of screw terminals, while reducing the effort required to operate the screws.
  • Another purpose is to not alter the alignment of the screw or the internal thread in the cover.
  • the retaining thread is provided on an internal part of the cylindrical hole of the cover, the remaining external part of the cylindrical hole having a sufficient length to accommodate most of the length of the threaded part of the head quote. This results in a significant reduction in the effort for operating the screw.
  • the screw is provided with a captive tightening plate applicable on one side against the conductor to be clamped and on the other side against a surface of the hood stop, the thread of the screw head being essentially free from the retaining thread when the plate is in abutment.
  • a captive tightening plate applicable on one side against the conductor to be clamped and on the other side against a surface of the hood stop, the thread of the screw head being essentially free from the retaining thread when the plate is in abutment.
  • the retaining thread can advantageously be provided on elements radially projecting and occupying small sectors provided at angular intervals regular, for example at 120 °, from the circumference of the cylindrical hole of the cover.
  • the diameter of the tapped part and the non-tapped part of the hole cylindrical cover advantageously differ from a small radial clearance to allow satisfactory alignment of the threaded rod with the clamping hole when the screw, the head is engaged in the retaining thread, must be screwed to tighten the conductor by means of the plate.
  • the retaining thread When the retaining thread is pre-tapped, it is preferably made with a derating generating a predetermined play absorbing the phase shift angle of the threaded rod clamping and head retaining assemblies.
  • the screw terminal illustrated in the figures includes a screw A intended for cooperate on the one hand with a fixed conductive surface B kept fixed in a base or a case C of a low-voltage electrical appliance and on the other hand with a cover E attached to the base of the appliance.
  • cover below used must be understood in the sense large and designates any cover, cover or case capable of enveloping all or part of one or more terminals of the device.
  • Screw A has a head 10, a threaded rod 11 and a core 12 intermediate between the head and the threaded rod a clamping plate 13 is retained captive, but with a certain freedom of movement, on the nucleus 12.
  • the plate 13 can be rectangular and flat or can have a V shape as shown in the figures.
  • the male thread T1 of the rod 11 cooperates with a female thread T'1 provided in a tapped hole in the fixed conductive area B.
  • the head 10 of the screw has a threaded portion 15 of diameter greater than that of the rod 11 and an operating part 16 provided with imprints for a toumevis; this part 16 is smooth and has a reduced diameter compared to the part 15.
  • the male thread T2 of part 15 cooperates with a female retaining thread T'2 provided in a cylindrical hole 17 formed in a relatively rigid wall 18 of the cover E which is perpendicular to the axis X-X of the screw.
  • the thread pitches T1, T2 are identical and the reduced diameter part 16 makes it possible to center the thread T2 on T'2.
  • the retaining thread T'2 is provided only on an internal part 19 of length l 1 of the cylindrical hole 17 of the cover E; the remaining external part 20 of the hole 17 is not threaded and has a length capable of accommodating the length of the threaded part 15 of the screw head, l 1 being less than the total half-length of the hole.
  • the diameter D of the part 20 of the hole 17 is slightly greater than the diameter D'2 of the part 19 (outside diameter of the thread T'2) so that the part 15 of the screw head can move with a small radial clearance in part 20, in order to maintain good axial guidance of the screw without excess operating forces.
  • Stop surfaces 21 are provided on the inside of the cover E to stop the wafer 13 and prevent the extraction of the screw A from the device.
  • an axial clearance e exists between the head 10 of the screw and the threaded part 19 of the hole 17.
  • the cover E is fixed to the base C of the device by permanent lateral connections 22 or removable, for example snap-fastening, arranged to resist the forces exerted along XX on the wall 18 when the threads T2, T'2 start to engage while the threads T1, T'1 are still in engagement.
  • the female retaining thread T'2 can be provided around the entire circumference of a part of length l 1 of the cylindrical hole 17 (FIG. 1). It is however preferably provided on small radially projecting elements in the form of sectors 23 of the circumference, for example at 120 ° ( Figures 2 and 3). The total length of the threads of thread T'2 is much less than that of the threads of thread T2. Side partitions 24 are provided in the housing C and / or the cover E to isolate the terminal and guide the plate 13 in its translational movement along XX.
  • the female retaining thread T'2 can be obtained either by self-tapping of the hole 17 of the wall 18 of plastic material by the male thread T2 of the head metal of the screw, either by prior tapping of hole 17 with a clearance predetermined to absorb the angular phase shift of the threaded connections T1, T'1 of the rod 11 and T2, T'2 of the head 10.
  • the screw A is rotated by means of a screwdriver introduced through the cylindrical hole 17 so as to come from the "open" position illustrated in FIG. 4 or 5 in which the threads T2, T'2 are engaged or of an intermediate position in which the threads T2, T'2 are not engaged until the tightening position illustrated in FIG. 1.
  • the stirrup 13 held captive on the core 12 of the screw is guided by the partitions 24 and pivots to adapt to conductor F and to clamp it between itself, set stop against the underside of the screw head, and the fixed conductive pad B.
  • the screw (FIG. 4) is rotated so as to engage at least a first thread of T2 in T'2, while the threads T1, T'1 remain in engagement.
  • the centering of the head 10 in the hole 17 is obtained by its reduced part 16 and / or by centering conformations linked to cover E. If the hole 17 has not been previously tapped, the male threads T2 create the female threads T'2 in the radially projecting elements 23 while the fixed area B takes up the corresponding forces via the threads T1, T'1.
  • the angular phase shift of the threaded connections T1, T'1 of the rod and T2, T'2 of the screw head can be caught by making the T'2 thread with a derating determining a radial clearance 25 and an axial clearance 26 absorbing the phase shift.

Description

La présente invention concerne un appareil électrique comprenant un couvercle ou capot en matière plastique et muni d'au moins une borne de connexion utilisant une vis de serrage de conducteur dont la tige filetée peut se visser dans un trou de serrage taraudé d'une pièce de connexion fixe et dont la tête est elle-même filetée pour assurer, en fin de dévissage, le maintien de cette tête dans un trou cylindrique de retenue ménagé dans le capot.The present invention relates to an electrical appliance comprising a plastic cover or cover and provided with at least one connection terminal using a conductor clamping screw whose threaded rod can be screwed into a clamping hole tapped with a fixed connection piece and whose head is itself threaded to ensure, at the end of unscrewing, the maintenance of this head in a hole retaining cylindrical formed in the cover.

Un appareil comprenant des bornes de connexion de ce type est décrit dans le brevet FR-2 667 989. L'opérateur qui intervient sur une telle borne éprouve quelques difficultés pour visser ou dévisser la vis lorsque les filetages de la tête et du trou correspondant taraudé dans le capot sont en prise.An apparatus comprising connection terminals of this type is described in patent FR-2,667,989. The operator working on such a terminal experiences some difficulty in screwing or unscrewing the screw when the threads of the head and corresponding threaded hole in the cover are engaged.

L'invention a pour but de parer à cet inconvénient en permettant à un appareil électrique d'accepter la connexion de câbles ou de cosses fermées au moyen de bornes à vis, tout en réduisant l'effort de manoeuvre des vis.The invention aims to overcome this drawback by allowing a electrical device to accept connection of cables or closed lugs to the by means of screw terminals, while reducing the effort required to operate the screws.

Elle a pour autre but de ne pas altérer l'alignement de la vis ni le taraudage ménagé dans le capot.Another purpose is to not alter the alignment of the screw or the internal thread in the cover.

Selon l'invention, le filetage de retenue est prévu sur une partie interne du trou cylindrique du capot, la partie externe restante du trou cylindrique ayant une longueur suffisante pour loger l'essentiel de la longueur de la partie filetée de la tête de vis. Il en résulte une diminution importante de l'effort de manoeuvre de la vis.According to the invention, the retaining thread is provided on an internal part of the cylindrical hole of the cover, the remaining external part of the cylindrical hole having a sufficient length to accommodate most of the length of the threaded part of the head quote. This results in a significant reduction in the effort for operating the screw.

De préférence, la vis est munie d'une plaquette de serrage imperdable applicable d'un côté contre le conducteur à serrer et de l'autre côté contre une surface de butée du capot, le filetage de la tête de vis étant essentiellement dégagé du filetage de retenue quand la plaquette est en butée. Il en résulte que les filets de retenue ne sont pas endommagés quand la vis tourne à vide après mise en butée de la plaquette de serrage.Preferably, the screw is provided with a captive tightening plate applicable on one side against the conductor to be clamped and on the other side against a surface of the hood stop, the thread of the screw head being essentially free from the retaining thread when the plate is in abutment. As a result, the nets of retainers are not damaged when the screw turns to empty after the stop of the the clamping plate.

Le filetage de retenue peut avantageusement être prévu sur des éléments radialement saillants et occupant de faibles secteurs prévus à intervalles angulaires réguliers, par exemple à 120°, de la circonférence du trou cylindrique du capot.The retaining thread can advantageously be provided on elements radially projecting and occupying small sectors provided at angular intervals regular, for example at 120 °, from the circumference of the cylindrical hole of the cover.

Le diamètre de la partie taraudée et de la partie non taraudée du trou cylindrique du capot diffèrent avantageusement d'un faible jeu radial pour permettre un alignement satisfaisant de la tige filetée avec le trou de serrage lorsque la vis, dont la tête est engagée dans le filetage de retenue, doit être vissée pour serrer le conducteur au moyen de la plaquette.The diameter of the tapped part and the non-tapped part of the hole cylindrical cover advantageously differ from a small radial clearance to allow satisfactory alignment of the threaded rod with the clamping hole when the screw, the head is engaged in the retaining thread, must be screwed to tighten the conductor by means of the plate.

Lorsque le filetage de retenue est prétaraudé, il est de préférence réalisé avec un déclassement engendrant un jeu prédéterminé absorbant le déphasage angulaire des assemblages filetés de serrage de la tige et de retenue de la tête. When the retaining thread is pre-tapped, it is preferably made with a derating generating a predetermined play absorbing the phase shift angle of the threaded rod clamping and head retaining assemblies.

Un mode de réalisation non limitatif de l'invention va être décrit ci-après en regard des dessins.

  • Sur les dessins, la figure 1 représente schématiquement une partie d'un appareil électrique muni d'une borne de connexion à vis spécifique selon l'invention.
  • La figure 2 est une coupe selon II-II d'un détail de la figure 1.
  • La figure 3 est une vue en perspective avant arrachement de ce détail.
  • Les figures 4 et 5 montrent la borne à vis dans deux phases de manoeuvre différentes.
  • La figure 6 montre un exemple de déclassement du filetage de retenue.
A nonlimiting embodiment of the invention will be described below with reference to the drawings.
  • In the drawings, FIG. 1 schematically represents part of an electrical appliance provided with a specific screw connection terminal according to the invention.
  • Figure 2 is a section on II-II of a detail of Figure 1.
  • Figure 3 is a perspective view before cutaway of this detail.
  • Figures 4 and 5 show the screw terminal in two different operating phases.
  • Figure 6 shows an example of derating the retaining thread.

La borne à vis illustrée sur les figures comprend une vis A destinée à coopérer d'une part avec une plage conductrice fixe B maintenue fixe dans un socle ou un boítier C d'appareil électrique à basse tension et d'autre part avec un capot E fixé au socle de l'appareil. Le terme capot ci-après utilisé doit être compris au sens large et désigne tout capot, couvercle ou boítier susceptible d'envelopper tout ou partie d'une borne ou de plusieurs bornes de l'appareil.The screw terminal illustrated in the figures includes a screw A intended for cooperate on the one hand with a fixed conductive surface B kept fixed in a base or a case C of a low-voltage electrical appliance and on the other hand with a cover E attached to the base of the appliance. The term cover below used must be understood in the sense large and designates any cover, cover or case capable of enveloping all or part of one or more terminals of the device.

La vis A comporte une tête 10, une tige filetée 11 et un noyau 12 intermédiaire entre la tête et la tige filetée une plaquette 13 de serrage est retenue de manière imperdable, mais avec une certaine liberté de mouvement, sur le noyau 12. La plaquette 13 peut être rectangulaire et plate ou peut avoir une forme en V comme indiqué sur les figures. Le filetage mâle T1 de la tige 11 coopère avec un filetage femelle T'1 prévu dans un perçage taraudé dans la plage conductrice fixe B.Screw A has a head 10, a threaded rod 11 and a core 12 intermediate between the head and the threaded rod a clamping plate 13 is retained captive, but with a certain freedom of movement, on the nucleus 12. The plate 13 can be rectangular and flat or can have a V shape as shown in the figures. The male thread T1 of the rod 11 cooperates with a female thread T'1 provided in a tapped hole in the fixed conductive area B.

La tête 10 de la vis présente une partie filetée 15 de diamètre supérieur à celui de la tige 11 et une partie de manoeuvre 16 munie d'empreintes pour un toumevis ; cette partie 16 est lisse et a un diamètre réduit par rapport à la partie 15. Le filetage mâle T2 de la partie 15 coopère avec un filetage femelle de retenue T'2 prévu dans un trou cylindrique 17 ménagé dans une paroi relativement rigide 18 du capot E qui est perpendiculaire à l'axe X-X de la vis. Les pas des filetages T1, T2 sont identiques et la partie 16 de diamètre réduit permet de centrer le filetage T2 sur T'2.The head 10 of the screw has a threaded portion 15 of diameter greater than that of the rod 11 and an operating part 16 provided with imprints for a toumevis; this part 16 is smooth and has a reduced diameter compared to the part 15. The male thread T2 of part 15 cooperates with a female retaining thread T'2 provided in a cylindrical hole 17 formed in a relatively rigid wall 18 of the cover E which is perpendicular to the axis X-X of the screw. The thread pitches T1, T2 are identical and the reduced diameter part 16 makes it possible to center the thread T2 on T'2.

Pour réduire les efforts de manoeuvre, le filetage de retenue T'2 est prévu seulement sur une partie interne 19 de longueur ℓ1 du trou cylindrique 17 du capot E ; la partie externe restante 20 du trou 17 n'est pas filetée et a une longueur apte à loger la longueur de la partie filetée 15 de la tête de vis, ℓ1 étant inférieure à la demi-longueur totale du trou. Le diamètre D de la partie 20 du trou 17 est légèrement supérieur au diamètre D'2 de la partie 19 (diamètre extérieur du filetage T'2) de façon que la partie 15 de la tête de vis puisse se déplacer avec un faible jeu radial dans la partie 20, afin de maintenir un bon guidage axial de la vis sans surplus d'efforts de manoeuvre.To reduce the operating forces, the retaining thread T'2 is provided only on an internal part 19 of length ℓ 1 of the cylindrical hole 17 of the cover E; the remaining external part 20 of the hole 17 is not threaded and has a length capable of accommodating the length of the threaded part 15 of the screw head, ℓ 1 being less than the total half-length of the hole. The diameter D of the part 20 of the hole 17 is slightly greater than the diameter D'2 of the part 19 (outside diameter of the thread T'2) so that the part 15 of the screw head can move with a small radial clearance in part 20, in order to maintain good axial guidance of the screw without excess operating forces.

Des surfaces de butée 21 sont prévues sur le côté intérieur du capot E pour arrêter la plaquette 13 et éviter l'extraction de la vis A hors de l'appareil. Lorsque la plaquette 13 est appliquée contre les surfaces 21, un jeu axial e existe entre la tête 10 de la vis et la partie filetée 19 du trou 17. Le capot E est fixé au socle C de l'appareil par des liaisons latérales 22 permanentes ou démontables, par exemple à encliquetage, agencées pour résister aux efforts exercés selon X-X sur la paroi 18 quand les filetages T2, T'2 commencent à venir en prise alors que les filetages T1, T'1 sont encore en prise.Stop surfaces 21 are provided on the inside of the cover E to stop the wafer 13 and prevent the extraction of the screw A from the device. When the plate 13 is applied against the surfaces 21, an axial clearance e exists between the head 10 of the screw and the threaded part 19 of the hole 17. The cover E is fixed to the base C of the device by permanent lateral connections 22 or removable, for example snap-fastening, arranged to resist the forces exerted along XX on the wall 18 when the threads T2, T'2 start to engage while the threads T1, T'1 are still in engagement.

Le filetage femelle de retenue T'2 peut être prévu sur toute la circonférence d'une partie de longueur ℓ1 du trou cylindrique 17 (figure 1). Il est cependant de préférence prévu sur de petits éléments radialement saillants en forme de secteurs 23 de la circonférence, par exemple à 120° (figures 2 et 3). La longueur totales des filets du filetage T'2 est nettement inférieure à celle des filets du filetage T2. Des cloisons latérales 24 sont prévues dans le boítier C et/ou le capot E pour isoler la bome et guider la plaquette 13 dans son mouvement de translation selon X-X.The female retaining thread T'2 can be provided around the entire circumference of a part of length ℓ 1 of the cylindrical hole 17 (FIG. 1). It is however preferably provided on small radially projecting elements in the form of sectors 23 of the circumference, for example at 120 ° (Figures 2 and 3). The total length of the threads of thread T'2 is much less than that of the threads of thread T2. Side partitions 24 are provided in the housing C and / or the cover E to isolate the terminal and guide the plate 13 in its translational movement along XX.

Le filetage femelle de retenue T'2 peut être obtenu soit par autotaraudage du trou 17 de la paroi 18 en matière plastique par le filetage mâle T2 de la tête métallique de la vis, soit par un taraudage préalable du trou 17 avec un jeu prédéterminé pour absorber le déphasage angulaire des assemblages filetés T1,T'1 de la tige 11 et T2,T'2 de la tête 10.The female retaining thread T'2 can be obtained either by self-tapping of the hole 17 of the wall 18 of plastic material by the male thread T2 of the head metal of the screw, either by prior tapping of hole 17 with a clearance predetermined to absorb the angular phase shift of the threaded connections T1, T'1 of the rod 11 and T2, T'2 of the head 10.

Le fonctionnement de la bome décrite va être décrit à présent en regard des figures 1, et 5.The operation of the described terminal will now be described with regard to Figures 1, and 5.

Pour serrer l'extrémité nue d'un conducteur ou câble F dans la bome, la vis A est mise en rotation au moyen d'un toumevis introduit par le trou cylindrique 17 de façon à venir de la position "ouverte" illustrée sur la figure 4 ou 5 dans laquelle les filetages T2,T'2 sont en prise ou d'une position intermédiaire dans laquelle les filetages T2,T'2 ne sont pas en prise jusqu'à la position de serrage illustrée figure 1. L'étrier 13, maintenu imperdable sur le noyau 12 de la vis, est guidé par les cloisons 24 et pivote pour s'adapter au conducteur F et pour le serrer entre lui-même, mis en butée contre la face inférieure de la tête de vis, et la plage conductrice fixe B.To clamp the bare end of a conductor or cable F into the terminal, the screw A is rotated by means of a screwdriver introduced through the cylindrical hole 17 so as to come from the "open" position illustrated in FIG. 4 or 5 in which the threads T2, T'2 are engaged or of an intermediate position in which the threads T2, T'2 are not engaged until the tightening position illustrated in FIG. 1. The stirrup 13, held captive on the core 12 of the screw, is guided by the partitions 24 and pivots to adapt to conductor F and to clamp it between itself, set stop against the underside of the screw head, and the fixed conductive pad B.

Pour ouvrir pleinement la bome et notamment lui permettre d'accepter l'introduction de cosses fermées G (figure 5), on met en rotation la vis (figure 4) de façon à engager au moins un premier filet de T2 dans T'2, tandis que les filetages T1,T'1 restent en prise. Le centrage de la tête 10 dans le trou 17 est obtenu par sa partie réduite 16 et/ou par des conformations de centrage liées au capot E. Si le trou 17 n'a pas été préalablement taraudé, les filets mâles T2 créent les filets femelles T'2 dans les éléments radialement saillants 23 tandis que la plage fixe B reprend les efforts correspondants via les filets T1,T'1. Si le trou 17 a été préalablement doté d'un filetage T'2, le déphasage angulaire des assemblages filetés T1,T'1 de la tige et T2,T'2 de la tête de vis peut être rattrapé par la réalisation du taraudage T'2 avec un déclassement déterminant un jeu radial 25 et un jeu axial 26 absorbant le déphasage.To fully open the boom and in particular allow it to accept the introduction of closed lugs G (FIG. 5), the screw (FIG. 4) is rotated so as to engage at least a first thread of T2 in T'2, while the threads T1, T'1 remain in engagement. The centering of the head 10 in the hole 17 is obtained by its reduced part 16 and / or by centering conformations linked to cover E. If the hole 17 has not been previously tapped, the male threads T2 create the female threads T'2 in the radially projecting elements 23 while the fixed area B takes up the corresponding forces via the threads T1, T'1. If hole 17 was previously provided with a thread T'2, the angular phase shift of the threaded connections T1, T'1 of the rod and T2, T'2 of the screw head can be caught by making the T'2 thread with a derating determining a radial clearance 25 and an axial clearance 26 absorbing the phase shift.

Claims (8)

  1. Electrical device comprising at least one connection terminal that comprises a screw (A) equipped with a head (10), a threaded rod with pitch T1 and a tightening plate (13) retained between the head and the captive threaded rod,
    the threaded rod being designed to cooperate with a threaded tightening hole (T'1) formed in a fixed conducting connection part (B) of the device, so that a conductor (F) can be tightened between the tightening plate and the fixed strip (B);
    the screw head (10) presenting a threaded part (T2) to cooperate with a retaining thread (T'2) tapped in a cylindrical hole (17) in a plastic cap (E) fitted on the equipment,
       characterized by the fact that:
    the retaining thread (T'2) with the same pitch as the tapped tightening hole (T'1) is provided only on an internal part (19) of the cylindrical hole (17) in the cap (E);
    the remaining external part (20) of the cylindrical hole (17) with diameter (D) slightly greater than the diameter (D'2) of the said internal part (19) is long enough to contain most of the length (ℓ2) of the threaded part (15) of the head (10) of the screw (A).
  2. Device according to claim 1, characterized by the fact that the tightening plate (13) may come into contact with a limit stop surface (21) of the cap (E) to ensure that the screw (A) cannot get lost, the thread (T2) of the screw head (10) being essentially disengaged from the retaining thread (T'2) when the plate is at its limit stop.
  3. Device according to claim 1, characterized by the fact that the retaining thread (T'2) is provided only on small radially projecting elements in the form of sectors (23) around the circumference of the cylindrical hole (17).
  4. Device according to claim 3, characterized by the fact that the radially projecting elements (23) are provided at angular intervals of 120°.
  5. Device according to claim 1, characterized by the fact that the threaded part (T2) of the screw head (10) fits into the untapped part (20) of the cylindrical hole (17) of the cap (E) with a small radial clearance.
  6. Device according to claim 1, characterized by the fact that the screw head (10) also has a smoothed part (16) with a reduced diameter for centering the threaded part (T2) of the screw head on the retaining thread (T'2).
  7. Device according to claim 1, characterized by the fact that the retaining thread (T'2) is self-tapped on radial projections (23) of the cylindrical hole (17) of the cap (E) by the thread (T2) of the screw head (10).
  8. Device according to claim 1, characterized by the fact that the retaining thread (T'2) is tapped in advance in the cylindrical hole (17) with a declassification that provides a pre-determined clearance (25, 26) absorbing the angular offset between the threaded rod tightening assembly (T1, T'1) and the head retaining assembly (T2, T'2).
EP95401292A 1994-06-13 1995-06-02 Electrical apparatus with clamping screw Expired - Lifetime EP0688063B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9407284 1994-06-13
FR9407284A FR2721142B1 (en) 1994-06-13 1994-06-13 Electrical device with a screw terminal.

Publications (2)

Publication Number Publication Date
EP0688063A1 EP0688063A1 (en) 1995-12-20
EP0688063B1 true EP0688063B1 (en) 1999-12-01

Family

ID=9464211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401292A Expired - Lifetime EP0688063B1 (en) 1994-06-13 1995-06-02 Electrical apparatus with clamping screw

Country Status (10)

Country Link
US (1) US5653614A (en)
EP (1) EP0688063B1 (en)
JP (1) JP3516773B2 (en)
KR (1) KR100206074B1 (en)
CN (1) CN1065363C (en)
BR (1) BR9502778A (en)
DE (1) DE69513571T2 (en)
ES (1) ES2139160T3 (en)
FR (1) FR2721142B1 (en)
TW (1) TW301372U (en)

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FR2769672B1 (en) * 1997-10-14 1999-12-03 Aesculap Sa SYSTEM FOR ASSEMBLING TWO PARTS BY AT LEAST ONE SCREW
AT409807B (en) * 1999-03-01 2002-11-25 Hiquel Elektronik Und Anlagenb ELECTRIC CLAMPING DEVICE
DE10304248A1 (en) * 2003-02-03 2004-01-29 Siemens Ag Terminal clamp device for connecting a ring cable lug and associated electrical device
FR2852451B1 (en) * 2003-03-13 2005-05-20 Framatome Connectors Int SYSTEM FOR ELECTRICALLY CONNECTING AND FASTENING AT LEAST ONE DRIVER ON A SUPPORT PART
JP2007018740A (en) * 2005-07-05 2007-01-25 Emuden Musen Kogyo Kk Terminal board device
CN100414775C (en) * 2006-07-21 2008-08-27 张建军 Electric connecting armour clamp assembly
CN101286597B (en) * 2007-04-12 2010-09-15 上海爱浦克施电气有限公司 Anti-drop open combined connecting terminal for screw nail
DE102007039709A1 (en) * 2007-08-22 2009-02-26 Abb Ag Installation switching device with a terminal arrangement
DE102009060373A1 (en) * 2009-12-24 2011-06-30 Schneider Electric Industries Sas Electric clamping device
US20130322050A1 (en) * 2012-05-31 2013-12-05 Daniel Douglas David Modular circuit breaker, kit, and methods of manufacture and assembly
FR3045960B1 (en) * 2015-12-17 2018-10-19 Schneider Electric Industries Sas DEVICE FOR CONNECTING AN ELECTRICAL CONDUCTOR HAVING AN EYE PITCH TO THE CONNECTING RANGE OF A TERMINAL OF AN ELECTRICAL APPARATUS, AND AN APPARATUS COMPRISING SUCH A DEVICE
US9857397B2 (en) * 2016-04-07 2018-01-02 Sensata Technologies, Inc. Modular packaging with elevating screw
CN106122238B (en) * 2016-08-23 2018-02-06 无锡市东赫金属制品有限公司 A kind of new anti-theft bolt
US11103094B2 (en) * 2018-01-08 2021-08-31 Jonathan Henry Carmona Aesthetic fasteners
DE102020212760A1 (en) 2020-10-09 2022-04-14 Leoni Bordnetz-Systeme Gmbh contact connector

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US954304A (en) * 1909-11-22 1910-04-05 William F Kenney Frictional lock-nut.
US1157615A (en) * 1915-04-22 1915-10-19 Rockwood Sprinkler Company Of Massachusetts Nut.
US1421638A (en) * 1921-05-14 1922-07-04 Eber M Lash Nut
GB548516A (en) * 1941-08-29 1942-10-13 Illinois Tool Works Improvements in screws
US3414866A (en) * 1967-05-08 1968-12-03 Alexander R. Norden Electrical terminals
FR2563947B1 (en) * 1984-05-02 1986-08-22 Alsthom Cgee PROTECTED TERMINAL CONNECTION ARRANGEMENT FOR ELECTRICAL EQUIPMENT
CN2069174U (en) * 1990-04-13 1991-01-09 张源 Terminal
FR2667989B1 (en) * 1990-10-16 1994-03-04 Telemecanique Sa CONNECTING TERMINAL WITH IMPERSIBLE SCREW AND TERMINAL USING TERMINALS OF THIS KIND.
FR2675639B1 (en) * 1991-04-22 1995-05-12 Telemecanique SCREW-CALIPER ASSEMBLY FOR ELECTRICAL DEVICE TERMINAL.
FR2688095B1 (en) * 1992-03-02 1996-05-24 Merlin Gerin CONNECTING TERMINAL WITH VARIABLE THICKNESS CALIPER AND TIGHT NUT.
US5304022A (en) * 1993-04-06 1994-04-19 Paul Huska Tapered threaded bolt with oval nut

Also Published As

Publication number Publication date
ES2139160T3 (en) 2000-02-01
DE69513571D1 (en) 2000-01-05
DE69513571T2 (en) 2000-03-30
US5653614A (en) 1997-08-05
CN1118565A (en) 1996-03-13
KR960002957A (en) 1996-01-26
FR2721142A1 (en) 1995-12-15
EP0688063A1 (en) 1995-12-20
BR9502778A (en) 1996-01-09
JPH0845571A (en) 1996-02-16
KR100206074B1 (en) 1999-07-01
TW301372U (en) 1997-03-21
CN1065363C (en) 2001-05-02
FR2721142B1 (en) 1996-07-19
JP3516773B2 (en) 2004-04-05

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